[time-nuts] Voltage standards
Poul-Henning Kamp
phk at phk.freebsd.dk
Mon Dec 1 08:22:01 UTC 2008
In message <49333DF9.9060804 at bellsouth.net>, Brian Kirby writes:
>A cryo may be hard to put togather (and maintain - from experience)
>but there are plenty of peltier junctions/devices out there...
You need LHe for superconductivity and a cryo is damn hard to put
together, if you don't want to spend a lot of money buying LHe.
This is the size of cryo used by the metro labs:
http://www.ipht-jena.de/photonische-instrumentierung/abteilungen/quantendetektion/anwendungen/voltage-standard.html
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
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Never attribute to malice what can adequately be explained by incompetence.
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